the tmuf mixing tool removes the clips of the block.
In TM2 the clips are not removed so it blocks the way to the gras. You can try building a straight uphill road (2-1-4) underground to "remove" the clip, if that is what you need.
Additionally you can then add 1-4-3 below the turn on the ground to get a smoother edge between road and gras.
It will look like this: